1 /* 2 * QEMU PC System Firmware 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * Copyright (c) 2011-2012 Intel Corporation 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu-common.h" 28 #include "qapi/error.h" 29 #include "sysemu/block-backend.h" 30 #include "qemu/error-report.h" 31 #include "qemu/option.h" 32 #include "qemu/units.h" 33 #include "hw/sysbus.h" 34 #include "hw/i386/x86.h" 35 #include "hw/i386/pc.h" 36 #include "hw/loader.h" 37 #include "hw/qdev-properties.h" 38 #include "hw/block/flash.h" 39 #include "sysemu/kvm.h" 40 #include "sev.h" 41 42 #define FLASH_SECTOR_SIZE 4096 43 44 static void pc_isa_bios_init(MemoryRegion *rom_memory, 45 MemoryRegion *flash_mem, 46 int ram_size) 47 { 48 int isa_bios_size; 49 MemoryRegion *isa_bios; 50 uint64_t flash_size; 51 void *flash_ptr, *isa_bios_ptr; 52 53 flash_size = memory_region_size(flash_mem); 54 55 /* map the last 128KB of the BIOS in ISA space */ 56 isa_bios_size = MIN(flash_size, 128 * KiB); 57 isa_bios = g_malloc(sizeof(*isa_bios)); 58 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, 59 &error_fatal); 60 memory_region_add_subregion_overlap(rom_memory, 61 0x100000 - isa_bios_size, 62 isa_bios, 63 1); 64 65 /* copy ISA rom image from top of flash memory */ 66 flash_ptr = memory_region_get_ram_ptr(flash_mem); 67 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); 68 memcpy(isa_bios_ptr, 69 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), 70 isa_bios_size); 71 72 memory_region_set_readonly(isa_bios, true); 73 } 74 75 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, 76 const char *name, 77 const char *alias_prop_name) 78 { 79 DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); 80 81 qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); 82 qdev_prop_set_uint8(dev, "width", 1); 83 qdev_prop_set_string(dev, "name", name); 84 object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); 85 object_property_add_alias(OBJECT(pcms), alias_prop_name, 86 OBJECT(dev), "drive"); 87 /* 88 * The returned reference is tied to the child property and 89 * will be removed with object_unparent. 90 */ 91 object_unref(OBJECT(dev)); 92 return PFLASH_CFI01(dev); 93 } 94 95 void pc_system_flash_create(PCMachineState *pcms) 96 { 97 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 98 99 if (pcmc->pci_enabled) { 100 pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", 101 "pflash0"); 102 pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", 103 "pflash1"); 104 } 105 } 106 107 void pc_system_flash_cleanup_unused(PCMachineState *pcms) 108 { 109 char *prop_name; 110 int i; 111 Object *dev_obj; 112 113 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 114 115 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 116 dev_obj = OBJECT(pcms->flash[i]); 117 if (!object_property_get_bool(dev_obj, "realized", &error_abort)) { 118 prop_name = g_strdup_printf("pflash%d", i); 119 object_property_del(OBJECT(pcms), prop_name); 120 g_free(prop_name); 121 object_unparent(dev_obj); 122 pcms->flash[i] = NULL; 123 } 124 } 125 } 126 127 /* 128 * Map the pcms->flash[] from 4GiB downward, and realize. 129 * Map them in descending order, i.e. pcms->flash[0] at the top, 130 * without gaps. 131 * Stop at the first pcms->flash[0] lacking a block backend. 132 * Set each flash's size from its block backend. Fatal error if the 133 * size isn't a non-zero multiple of 4KiB, or the total size exceeds 134 * pcms->max_fw_size. 135 * 136 * If pcms->flash[0] has a block backend, its memory is passed to 137 * pc_isa_bios_init(). Merging several flash devices for isa-bios is 138 * not supported. 139 */ 140 static void pc_system_flash_map(PCMachineState *pcms, 141 MemoryRegion *rom_memory) 142 { 143 hwaddr total_size = 0; 144 int i; 145 BlockBackend *blk; 146 int64_t size; 147 PFlashCFI01 *system_flash; 148 MemoryRegion *flash_mem; 149 void *flash_ptr; 150 int flash_size; 151 int ret; 152 153 assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); 154 155 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 156 system_flash = pcms->flash[i]; 157 blk = pflash_cfi01_get_blk(system_flash); 158 if (!blk) { 159 break; 160 } 161 size = blk_getlength(blk); 162 if (size < 0) { 163 error_report("can't get size of block device %s: %s", 164 blk_name(blk), strerror(-size)); 165 exit(1); 166 } 167 if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { 168 error_report("system firmware block device %s has invalid size " 169 "%" PRId64, 170 blk_name(blk), size); 171 info_report("its size must be a non-zero multiple of 0x%x", 172 FLASH_SECTOR_SIZE); 173 exit(1); 174 } 175 if ((hwaddr)size != size 176 || total_size > HWADDR_MAX - size 177 || total_size + size > pcms->max_fw_size) { 178 error_report("combined size of system firmware exceeds " 179 "%" PRIu64 " bytes", 180 pcms->max_fw_size); 181 exit(1); 182 } 183 184 total_size += size; 185 qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", 186 size / FLASH_SECTOR_SIZE); 187 sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); 188 sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, 189 0x100000000ULL - total_size); 190 191 if (i == 0) { 192 flash_mem = pflash_cfi01_get_memory(system_flash); 193 pc_isa_bios_init(rom_memory, flash_mem, size); 194 195 /* Encrypt the pflash boot ROM */ 196 if (sev_enabled()) { 197 flash_ptr = memory_region_get_ram_ptr(flash_mem); 198 flash_size = memory_region_size(flash_mem); 199 /* 200 * OVMF places a GUIDed structures in the flash, so 201 * search for them 202 */ 203 pc_system_parse_ovmf_flash(flash_ptr, flash_size); 204 205 ret = sev_es_save_reset_vector(flash_ptr, flash_size); 206 if (ret) { 207 error_report("failed to locate and/or save reset vector"); 208 exit(1); 209 } 210 211 sev_encrypt_flash(flash_ptr, flash_size, &error_fatal); 212 } 213 } 214 } 215 } 216 217 void pc_system_firmware_init(PCMachineState *pcms, 218 MemoryRegion *rom_memory) 219 { 220 PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); 221 int i; 222 BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; 223 224 if (!pcmc->pci_enabled) { 225 x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, true); 226 return; 227 } 228 229 /* Map legacy -drive if=pflash to machine properties */ 230 for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { 231 pflash_cfi01_legacy_drive(pcms->flash[i], 232 drive_get(IF_PFLASH, 0, i)); 233 pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); 234 } 235 236 /* Reject gaps */ 237 for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { 238 if (pflash_blk[i] && !pflash_blk[i - 1]) { 239 error_report("pflash%d requires pflash%d", i, i - 1); 240 exit(1); 241 } 242 } 243 244 if (!pflash_blk[0]) { 245 /* Machine property pflash0 not set, use ROM mode */ 246 x86_bios_rom_init(MACHINE(pcms), "bios.bin", rom_memory, false); 247 } else { 248 if (kvm_enabled() && !kvm_readonly_mem_enabled()) { 249 /* 250 * Older KVM cannot execute from device memory. So, flash 251 * memory cannot be used unless the readonly memory kvm 252 * capability is present. 253 */ 254 error_report("pflash with kvm requires KVM readonly memory support"); 255 exit(1); 256 } 257 258 pc_system_flash_map(pcms, rom_memory); 259 } 260 261 pc_system_flash_cleanup_unused(pcms); 262 } 263